Plastic box



FIG. 1 is an isometric view of a plastic box showing the claimed design.

FIG. 2 is a left side elevation view of claimed design.

FIG. 3 is a right side elevation view of the claimed design.

FIG. 4 is a front elevation view of the claimed design.

FIG. 5 is a rear elevation view of the claimed design.

FIG. 6 is a top plan view of the claimed design; and,

FIG. 7 is a bottom plan view of the claimed design. 

CLAIM The ornamental design for a plastic box, as shown and described. 